title: Short term vitamin E supplementation has no effect on platelet function, plasma phospholipase A2 and lyso-PAF in male volunteers.
abstract: 1. Based largely upon in vitro studies, vitamin E has been reported to inhibit phospholipase A2 activity, to alter phospholipid metabolism and reduce platelet aggregation. 2. The effect of dietary supplementation with D-alpha-tocopherol (1500 iu/day for 14 days) was studied in nine males, 41-63 years old, comparing active treatment with a preceding placebo period. 3. Despite an increase from 2.6 +/- 0.8 (s.d.) x 10(-5) mol/L to 6.0 +/- 1.8 10(-5) mol/L in plasma vitamin E there were no significant changes in the aggregation of diluted whole blood or platelet rich plasma to adenosine diphosphate (ADP) or collagen, in plasma phospholipase A2 activity or plasma lyso-platelet-activating factor (lyso-PAF) (bioassay after in vitro acetylation to PAF). 4. High dose vitamin E dietary supplementation had no effect on these phospholipid and platelet parameters.
authors.affiliation: Department of Medicine and Cardiology, Royal Perth Hospital, WA, Australia.
authors.forename: P L
authors.initials: PL
authors.lastname: Silbert
authors.forename: L L
authors.initials: LL
authors.lastname: Leong
authors.forename: M J
authors.initials: MJ
authors.lastname: Sturm
authors.forename: J
authors.initials: J
authors.lastname: Strophair
authors.forename: R R
authors.initials: RR
authors.lastname: Taylor
mesh_terms: D000328:Adult; D004032:Diet; D006801:Humans; D008297:Male; D008875:Middle Aged; D010741:Phospholipases A / Q000097:blood*; D054467:Phospholipases A2; D010743:Phospholipids / Q000378:metabolism; D010972:Platelet Activating Factor / Q000031:analogs & derivatives* / Q000378:metabolism; D010974:Platelet Aggregation / Q000187:drug effects*; D016037:Single-Blind Method; D013997:Time Factors; D014810:Vitamin E / Q000097:blood / Q000494:pharmacology*
chemical_list: C029271:O-deacetyl platelet activating factor; D010743:Phospholipids; D010972:Platelet Activating Factor; D014810:Vitamin E; D010741:Phospholipases A; D054467:Phospholipases A2